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- W4205452016 abstract "ABSTRACT A new W filter, the 1‐(4‐ tert ‐butylphenyl)‐2‐decanyl‐3‐(4′‐methoxyphenyl)‐propane‐1,3‐dione, called C10‐DBM, was prepared by grafting a 10‐carbon aliphatic chain to the acarbonyl position of 4‐ tert ‐butyl‐4′‐methoxydibenzoylmethane (BM‐DBM), a well‐known and often used UV filter. The UV‐A absorption efficiency of organic solutions containing the new filter was tested and compared with identical solutions containing BM‐DBM with or without irradiation (xenon lamp). The originality of this new filter is that its UV‐A absorbance appeared during irradiation of the molecule. Although the molar absorption coefficient of C10‐DBM in the UV‐A domain was lower than that of BM‐DBM, the solutions absorption exhibited a much more photostable behavior under irradiation. In this study, we first demonstrated that C10‐DBM was a precursor of BM‐DBM (enol isomer) by means of high performance liquid chromatography followed by mass spectrometry. Indeed, we showed that the UV‐A absorption of C10‐DBM solutions appearing during the irradiation of the molecule was due to a Norrish‐II reaction (β‐cleavage), which induced the release of the BM‐DBM enol form and l‐decene. Then, we established a kinetic model for the photochemistry of C10‐DBM and fitted the variation of W absorption spectra to confirm the proposed mechanism." @default.
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- W4205452016 date "2004-09-01" @default.
- W4205452016 modified "2023-10-17" @default.
- W4205452016 title "Photochemical Behavior of a New Long‐chain UV Absorber† Drived from 4‐<i>tert</i>‐Butyl‐4′‐Methoxydibenzoylmethane<sup>¶</sup>" @default.
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- W4205452016 doi "https://doi.org/10.1111/j.1751-1097.2004.tb00089.x" @default.
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